I think it would be interesting to put one morphing creature(shapeshifter - rememeber of one in kotor, who was in shadowlands on Kashyyk - and you had to kill him in quest for Genoharadan;there was also one bounty metamorph in SW:E2 who is trying to kill Padme) in player's team.
As he gains levels he will gain more shapes he can take.This ability would be cool in some situation's.For exam:you need to infilatrate into heavy guarded Sith base, and you take your shapeshifting friend, turn his shape to sith droid, dark jedi etc. and easily walk into base, insted of taking long combat with defence forces.
And how about some Juhani's friend who joined you to avange her death(yeah, that cat women could die in war after kotor1) and he/she is filled with anger and it's up to you to set up his/her alignment + you ll get some info from this jedi about what happened to the Ebon Hawk's previous crew(Revan and his mates).He/She has been gathering that info in hope to find them and join.Insted of them he or she found you in that hangar where you take Ebon Hawk first time in Kotor2.
p.s. i think we shouldn't post suggestions of this kind in unnoficial f.a.q. post!